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the following built-in functions Serial Number Method and Description Example 1 Len (tuple)Counts the number of tuple elements. 2 Max (tuple)Returns the element's maximum value in a tuple. 3 MIN (tuple)Returns the element minimum value in a tuple. 4 Tuple (SEQ)Converts a list to a tuple. >>> list1= [' Google ', ' Taobao ', ' w3cschool ', ' Baidu ']>>> tuple1=tuple (li

tuple tuplesWhy do I need tuples ?For example : Print the user's nameUserinfo1 = "Fentiao 4 Male"Userinfo[0:7]Conclusion : The method of extracting name / age / Gender in the string is inconvenient , the birth tuple .First, definition of tuples( you can think of tuples as a container, and any data type can be placed inside this container. )- Create tuples by assigning values;- Create tuples from factory method?- define an empty tupletuple = ()?- A tuple that defines a single value , Be sure to

, you can specify a value, such as 600, or a special value, such as device-width for the width of the device (in pixels of the CSS when scaled to 100%). Height: corresponds to width, specifying height. Initial-scale: The initial zoom ratio, which is the scale at which the page is first load. Maximum-scale: Allows the user to zoom to the maximum scale. Minimum-scale: The minimum scale to which the user is allowed to zoom. User-scalable: Whether the user can scale manually.

First, the syntax:Second, parameter analysis:1) name option: Keywords (keyword), description (Website content description), author (author), Robots (Robot wizard), etc.2) Http-equiv: Can be used in place of the name entry, the commonly used options are expires (term), Pragma (cache mode), refresh (refresh), Set-cookie (Cookie setting), Window-target ( Display the settings of the window), Content-type (display character set settings) and so on.3) Content item: Determines what string this item fil

http://ningning.today/2017/01/25/python/simple-python-metaclass/Https://stackoverflow.com/questions/25221072/how-to-write-a-python-abc-with-a-concrete-initializer-in-python-2-6-to-3-5Examples of specific operationsView Flask-restful Source views.py fileClass View (object): "" "alternative-to-use View functions. A subclass have to Implement:meth: ' Dispatch_request ' which are called with the view arguments from the URL routing sy Stem. If:attr: ' Methods ' is provided the methods does not has t

First, the syntax:Second, parameter analysis:1) name option: Keywords (keyword), description (Website content description), author (author), Robots (Robot wizard), etc.2) Http-equiv: Can be used in place of the name entry, the commonly used options are expires (term), Pragma (cache mode), refresh (refresh), Set-cookie (Cookie setting), Window-target ( Display the settings of the window), Content-type (display character set settings) and so on.3) Content item: Determines what string this item fil

The error message is as follows: Org.apache.jasper.JasperException:Unable to read TLD ' meta-inf/c.tld ' from JAR file ' File:/c:/program files/apache softw are Foundation/tomcat 5.5/webapps/jspbook/web-inf/lib/jstl-1.2.jar ": org.apache.jasper.JasperException:Failed to Load or instantiate Taglibraryvalidator Class:org.apache.taglibs.standard.tlv.JstlCoreTLV There are a variety of solutions available on the Web, but none of them apply to my situat

Mdtest is a benchmark tool for server Meta data processing capabilities that can be used to simulate open/stat/close operations on files or directories, and then return reports. It supports MPI, which can be used to coordinate a large number of clients to initiate requests to the server. Download Address: http://sourceforge.net/projects/mdtest/ In the thesis: The drawing table is as follows: usage : mdtest [-B] [-b] [-c] [-c] [D-TestDir] [-d]

(orientation:portrait) { body{ width:700px; height:800px; Transform:rotate (90deg); -ms-transform:rotate (90deg); -moz-transform:rotate (90deg); -webkit-transform:rotate (90deg); } } var mql = Window.matchmedia (' (orientation:portrait) '); Console.log (MQL); function Handleorientationchange (MQL) { if (mql.matches) { console.log (' portrait '); Vertical screen alert ("number"); } else { console.log (' landscape ')

We know that search engines have their own "search bots", and they build their own databases by constantly crawling information on the web along the pages of links (typically HTTP and src links). for Web site managers and content providers, sometimes there will be some site content, do not want to be crawled by robots and open. To solve this problem, the robots development community offers two options: one is robots.txt and the other is the robots meta